ONE of my burners on the coleman grill has low flames, the other burner is normal. what do I do?

Yellow flame is blocked burner clean out with Air line ,or wire brush ,prick out burner holes .

Should be a damper which can be moved cutting back and increasing the air intake

Tony B. s answer gave me the idea to try and spray carburetor cleaner to try and unclog the filter. Worked like a charm. I now have a full flame coming out of both burners.

Hi inomura...
Look at the left burner, pipe,air hole adjustment,etc because it is operating good.
You will see a difference to it compared to the on the right.
The right pipe, air hole, or the length the pipe that are iserted in the gas control valve is different from the left.
The yellow flame indicates that not enough air is getting to the flame getting to the right flame ignition point.
The left flame is nice and blue...normal, the right is yellow indicating that not enough air is getting to the flame ignition point...look to see if the air hole adjustment is different than the one on the left...there is something open more or less, improperly adjusted.
Once you have it adjusted properly the right flame will burn bright blue just as it does on the left.
Please take time to rate me

Does the flame height, when turned to HIGH on the burners, appear to be lower than normal? If so, it's one of two things:

1. You are low or about ready to run out of gas in the tank. Check gas level in tank.

2. The grill's regulated is partially locked up. Turn the tank valve OFF. Disconnect the hose from the tank. Wait 5 minutes and reconnect the hose to the tank. Open the tank valve VERY, VERY SLOWLY (Slow motion, slow). Once the valve is fully open, light the burner farthest from the grill first and turn it to HIGH. Did the burner light and does the flame height look correct? If so. light the remaining burners the same way. Do ALL of the flame heights look correct? If so, you solved the problem. Remember to always open the tank valve Very, Very Slowly.

If none of the above solved the problem and (hint) the burners are clean and not clogged. You need to replace the grill's Hose/Regulator Assembly. You can purchase one at any home center or hardware store that sells gas grills and accessories. They run about $30.00. Take your old one with you, just for comparison purposes.

Hope this helped you troubleshoot and solve the problem. Please let me know. Thanks and Happy Grilling!!

Orange or yellow flame is usually an indication of too much fuel, or not enough air mixture. Make sure all areas where burners would receive air from, are cleaned of spider webs, debris etc., and be sure when set up, nothing is close to it that would block that air flow from entering.

could be blocked burners of blocked orfice , or reg on tank , which all give low pressure

Had same problem. Coleman tech support said, " clean with pipe cleaners". No directions....I would think they would provide a step by step protocol. So, I chose to take the knobs off and use the pipe cleaner where I could. I was able to take one of the two burner control knobs apart. After sticking the clean in every nook I could find, I put back together, and the flame on that burner is back to normal,

Good Luck--Daryl in Burnsville, MN

Try looking for webs back to where the burner tube meets the valve. Otherwise you need to remove burner tube to access back of valve to clean with a torch tip cleaner or compressed air, (remember to disconnect grill from gas source first) inside valve orifice.  Usually the back of valve can be removed with a wrench. Worst case you always get a new valve off internet if you can't resolve the plug. Hope this helps, good luck.  

If the pilot won't stay lit, the thermocouple may be loose or faulty, the pilot orifice may be clogged, or the pilot light's flame may be set too low and needs to be adjusted. You can clear a clogged orifice with a piece of thin wire, such as a bread tie with the paper stripped off of it. Be sure to turn off the gas to the furnace first! Also shut off the switch or circuit breaker that controls power to the furnace. Just poke the thin wire into the tiny orifice where the pilot flame normally burns to knock off any ash or debris. Some pilots have a flame adjustment screw for adjusting the flame. To adjust this, refer to your owner's manual. Normally, this is simply a matter of turning the flame adjustment screw to achieve a full, steady 1 1/2-inch to 2-inch flame that doesn't have any yellow in it.